[PATCH 1/3] PCI: meson: Remove cast between incompatible function type

[PATCH 1/3] PCI: meson: Remove cast between incompatible function type

[Krzysztof Wilczyński]

Rather than casting void(*)(struct clk *) to void (*)(void *), that
forces conversion to an incompatible function type, replace the cast
with a small local stub function with a signature that matches what
the devm_add_action_or_reset() function expects.

The sub function takes a void *, then passes it directly to
clk_disable_unprepare(), which handles the more specific type.

Reported by clang when building with warnings enabled:

  drivers/pci/controller/dwc/pci-meson.c:191:6: warning: cast from 'void (*)(struct clk *)' to 'void (*)(void *)' converts to incompatible function type [-Wcast-function-type-strict]
                                   (void (*) (void *))clk_disable_unprepare,
                                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
No functional changes are intended.

Fixes: 9c0ef6d34fdb ("PCI: amlogic: Add the Amlogic Meson PCIe controller driver")
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
---
 drivers/pci/controller/dwc/pci-meson.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/controller/dwc/pci-meson.c b/drivers/pci/controller/dwc/pci-meson.c
index c1527693bed9..34990a6363d0 100644
--- a/drivers/pci/controller/dwc/pci-meson.c
+++ b/drivers/pci/controller/dwc/pci-meson.c
@@ -163,6 +163,13 @@ static int meson_pcie_reset(struct meson_pcie *mp)
 	return 0;
 }
 
+static inline void meson_pcie_disable_clock(void *data)
+{
+	struct clk *clk = data;
+
+	clk_disable_unprepare(clk);
+}
+
 static inline struct clk *meson_pcie_probe_clock(struct device *dev,
 						 const char *id, u64 rate)
 {
@@ -187,9 +194,7 @@ static inline struct clk *meson_pcie_probe_clock(struct device *dev,
 		return ERR_PTR(ret);
 	}
 
-	devm_add_action_or_reset(dev,
-				 (void (*) (void *))clk_disable_unprepare,
-				 clk);
+	devm_add_action_or_reset(dev, meson_pcie_disable_clock, clk);
 
 	return clk;
 }
-- 
2.41.0


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[PATCH 2/3] PCI: keembay: Remove cast between incompatible function type

[Krzysztof Wilczyński]

Rather than casting void(*)(struct clk *) to void (*)(void *), that
forces conversion to an incompatible function type, replace the cast
with a small local stub function with a signature that matches what
the devm_add_action_or_reset() function expects.

The sub function takes a void *, then passes it directly to
clk_disable_unprepare(), which handles the more specific type.

Reported by clang when building with warnings enabled:

  drivers/pci/controller/dwc/pcie-keembay.c:172:12: warning: cast from 'void (*)(struct clk *)' to 'void (*)(void *)' converts to incompatible function type [-Wcast-function-type-strict]
                                         (void(*)(void *))clk_disable_unprepare,
                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
No functional changes are intended.

Fixes: 0c87f90b4c13 ("PCI: keembay: Add support for Intel Keem Bay")
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
---
 drivers/pci/controller/dwc/pcie-keembay.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-keembay.c b/drivers/pci/controller/dwc/pcie-keembay.c
index f90f36bac018..289bff99d762 100644
--- a/drivers/pci/controller/dwc/pcie-keembay.c
+++ b/drivers/pci/controller/dwc/pcie-keembay.c
@@ -148,6 +148,13 @@ static const struct dw_pcie_ops keembay_pcie_ops = {
 	.stop_link	= keembay_pcie_stop_link,
 };
 
+static inline void keembay_pcie_disable_clock(void *data)
+{
+	struct clk *clk = data;
+
+	clk_disable_unprepare(clk);
+}
+
 static inline struct clk *keembay_pcie_probe_clock(struct device *dev,
 						   const char *id, u64 rate)
 {
@@ -168,9 +175,7 @@ static inline struct clk *keembay_pcie_probe_clock(struct device *dev,
 	if (ret)
 		return ERR_PTR(ret);
 
-	ret = devm_add_action_or_reset(dev,
-				       (void(*)(void *))clk_disable_unprepare,
-				       clk);
+	ret = devm_add_action_or_reset(dev, keembay_pcie_disable_clock, clk);
 	if (ret)
 		return ERR_PTR(ret);
 
-- 
2.41.0


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RE: [PATCH 2/3] PCI: keembay: Remove cast between incompatible function type

[Thokala, Srikanth]

> -----Original Message-----
> From: Krzysztof Wilczyński <kwilczynski@kernel.org>
> Sent: Thursday, June 29, 2023 10:30 PM
> To: Bjorn Helgaas <bhelgaas@google.com>
> Cc: Lorenzo Pieralisi <lpieralisi@kernel.org>; Rob Herring
> <robh@kernel.org>; Yue Wang <yue.wang@Amlogic.com>; Neil Armstrong
> <neil.armstrong@linaro.org>; Kevin Hilman <khilman@baylibre.com>; Jerome
> Brunet <jbrunet@baylibre.com>; Martin Blumenstingl
> <martin.blumenstingl@googlemail.com>; Thokala, Srikanth
> <srikanth.thokala@intel.com>; Daire McNamara
> <daire.mcnamara@microchip.com>; Conor Dooley <conor.dooley@microchip.com>;
> linux-pci@vger.kernel.org; linux-arm-kernel@lists.infradead.org; linux-
> amlogic@lists.infradead.org; linux-riscv@lists.infradead.org
> Subject: [PATCH 2/3] PCI: keembay: Remove cast between incompatible
> function type
> 
> Rather than casting void(*)(struct clk *) to void (*)(void *), that
> forces conversion to an incompatible function type, replace the cast
> with a small local stub function with a signature that matches what
> the devm_add_action_or_reset() function expects.
> 
> The sub function takes a void *, then passes it directly to
> clk_disable_unprepare(), which handles the more specific type.
> 
> Reported by clang when building with warnings enabled:
> 
>   drivers/pci/controller/dwc/pcie-keembay.c:172:12: warning: cast from
> 'void (*)(struct clk *)' to 'void (*)(void *)' converts to incompatible
> function type [-Wcast-function-type-strict]
>                                          (void(*)(void
> *))clk_disable_unprepare,
> 
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> No functional changes are intended.
> 
> Fixes: 0c87f90b4c13 ("PCI: keembay: Add support for Intel Keem Bay")
> Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
> ---
>  drivers/pci/controller/dwc/pcie-keembay.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-keembay.c
> b/drivers/pci/controller/dwc/pcie-keembay.c
> index f90f36bac018..289bff99d762 100644
> --- a/drivers/pci/controller/dwc/pcie-keembay.c
> +++ b/drivers/pci/controller/dwc/pcie-keembay.c
> @@ -148,6 +148,13 @@ static const struct dw_pcie_ops keembay_pcie_ops = {
>  	.stop_link	= keembay_pcie_stop_link,
>  };
> 
> +static inline void keembay_pcie_disable_clock(void *data)
> +{
> +	struct clk *clk = data;
> +
> +	clk_disable_unprepare(clk);
> +}
> +
>  static inline struct clk *keembay_pcie_probe_clock(struct device *dev,
>  						   const char *id, u64 rate)
>  {
> @@ -168,9 +175,7 @@ static inline struct clk
> *keembay_pcie_probe_clock(struct device *dev,
>  	if (ret)
>  		return ERR_PTR(ret);
> 
> -	ret = devm_add_action_or_reset(dev,
> -				       (void(*)(void *))clk_disable_unprepare,
> -				       clk);
> +	ret = devm_add_action_or_reset(dev, keembay_pcie_disable_clock,
> clk);


Acked-by: Srikanth Thokala <srikanth.thokala@intel.com>

Thank you.

Srikanth

>  	if (ret)
>  		return ERR_PTR(ret);
> 
> --
> 2.41.0

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[PATCH 3/3] PCI: microchip: Remove cast between incompatible function type

[Krzysztof Wilczyński]

Rather than casting void(*)(struct clk *) to void (*)(void *), that
forces conversion to an incompatible function type, replace the cast
with a small local stub function with a signature that matches what
the devm_add_action_or_reset() function expects.

The sub function takes a void *, then passes it directly to
clk_disable_unprepare(), which handles the more specific type.

Reported by clang when building with warnings enabled:

  drivers/pci/controller/pcie-microchip-host.c:866:32: warning: cast from 'void (*)(struct clk *)' to 'void (*)(void *)' converts to incompatible function type [-Wcast-function-type-strict]
          devm_add_action_or_reset(dev, (void (*) (void *))clk_disable_unprepare,
                                        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
No functional changes are intended.

Fixes: 6f15a9c9f941 ("PCI: microchip: Add Microchip PolarFire PCIe controller driver")
Co-developed-by: Daire McNamara <daire.mcnamara@microchip.com>
Signed-off-by: Daire McNamara <daire.mcnamara@microchip.com>
Co-developed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Simon Horman <horms@kernel.org>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
---
 drivers/pci/controller/pcie-microchip-host.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/pcie-microchip-host.c b/drivers/pci/controller/pcie-microchip-host.c
index 5e710e485464..d30286f815e7 100644
--- a/drivers/pci/controller/pcie-microchip-host.c
+++ b/drivers/pci/controller/pcie-microchip-host.c
@@ -848,6 +848,13 @@ static const struct irq_domain_ops event_domain_ops = {
 	.map = mc_pcie_event_map,
 };
 
+static inline void mc_pcie_deinit_clk(void *data)
+{
+	struct clk *clk = data;
+
+	clk_disable_unprepare(clk);
+}
+
 static inline struct clk *mc_pcie_init_clk(struct device *dev, const char *id)
 {
 	struct clk *clk;
@@ -863,8 +870,7 @@ static inline struct clk *mc_pcie_init_clk(struct device *dev, const char *id)
 	if (ret)
 		return ERR_PTR(ret);
 
-	devm_add_action_or_reset(dev, (void (*) (void *))clk_disable_unprepare,
-				 clk);
+	devm_add_action_or_reset(dev, mc_pcie_deinit_clk, clk);
 
 	return clk;
 }
-- 
2.41.0


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Re: [PATCH 3/3] PCI: microchip: Remove cast between incompatible function type

[Conor Dooley]

[-- Attachment #1.1: Type: text/plain, Size: 1615 bytes --]

On Thu, Jun 29, 2023 at 04:59:56PM +0000, Krzysztof Wilczyński wrote:
> Rather than casting void(*)(struct clk *) to void (*)(void *), that
> forces conversion to an incompatible function type, replace the cast
> with a small local stub function with a signature that matches what
> the devm_add_action_or_reset() function expects.
> 
> The sub function takes a void *, then passes it directly to
> clk_disable_unprepare(), which handles the more specific type.
> 
> Reported by clang when building with warnings enabled:
> 
>   drivers/pci/controller/pcie-microchip-host.c:866:32: warning: cast from 'void (*)(struct clk *)' to 'void (*)(void *)' converts to incompatible function type [-Wcast-function-type-strict]
>           devm_add_action_or_reset(dev, (void (*) (void *))clk_disable_unprepare,
>                                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> No functional changes are intended.
> 
> Fixes: 6f15a9c9f941 ("PCI: microchip: Add Microchip PolarFire PCIe controller driver")
> Co-developed-by: Daire McNamara <daire.mcnamara@microchip.com>
> Signed-off-by: Daire McNamara <daire.mcnamara@microchip.com>
> Co-developed-by: Simon Horman <horms@kernel.org>
> Signed-off-by: Simon Horman <horms@kernel.org>
> Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>

This looks to be the same content wise as the patch I previously acked &
effectively the same as the one I previously reviewed - you could have
picked up either of those tags from the other submissions tbh.

Acked-by: Conor Dooley <conor.dooley@microchip.com>

Cheers,
Conor.

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Re: [PATCH 3/3] PCI: microchip: Remove cast between incompatible function type

[Krzysztof Wilczyński]

Hello,

[...]
> > Fixes: 6f15a9c9f941 ("PCI: microchip: Add Microchip PolarFire PCIe controller driver")
> > Co-developed-by: Daire McNamara <daire.mcnamara@microchip.com>
> > Signed-off-by: Daire McNamara <daire.mcnamara@microchip.com>
> > Co-developed-by: Simon Horman <horms@kernel.org>
> > Signed-off-by: Simon Horman <horms@kernel.org>
> > Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
> 
> This looks to be the same content wise as the patch I previously acked &
> effectively the same as the one I previously reviewed - you could have
> picked up either of those tags from the other submissions tbh.

I had thought about it but decided against it, as I wasn't sure if that
would be OK, given a new series and new author, etc., even though the code
is almost identical. I have seen you offered Reviewed-by and Acked-by once
before, and I appreciate that.

> Acked-by: Conor Dooley <conor.dooley@microchip.com>

Thank you!

	Krzysztof

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Re: [PATCH 1/3] PCI: meson: Remove cast between incompatible function type

[Neil Armstrong]

On 29/06/2023 18:59, Krzysztof Wilczyński wrote:
> Rather than casting void(*)(struct clk *) to void (*)(void *), that
> forces conversion to an incompatible function type, replace the cast
> with a small local stub function with a signature that matches what
> the devm_add_action_or_reset() function expects.
> 
> The sub function takes a void *, then passes it directly to
> clk_disable_unprepare(), which handles the more specific type.
> 
> Reported by clang when building with warnings enabled:
> 
>    drivers/pci/controller/dwc/pci-meson.c:191:6: warning: cast from 'void (*)(struct clk *)' to 'void (*)(void *)' converts to incompatible function type [-Wcast-function-type-strict]
>                                     (void (*) (void *))clk_disable_unprepare,
>                                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> No functional changes are intended.
> 
> Fixes: 9c0ef6d34fdb ("PCI: amlogic: Add the Amlogic Meson PCIe controller driver")
> Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
> ---
>   drivers/pci/controller/dwc/pci-meson.c | 11 ++++++++---
>   1 file changed, 8 insertions(+), 3 deletions(-)
> 

<snip>


Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>

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Re: [PATCH 1/3] PCI: meson: Remove cast between incompatible function type

[Krzysztof Wilczyński]

Hello,

> Rather than casting void(*)(struct clk *) to void (*)(void *), that
> forces conversion to an incompatible function type, replace the cast
> with a small local stub function with a signature that matches what
> the devm_add_action_or_reset() function expects.
> 
> The sub function takes a void *, then passes it directly to
> clk_disable_unprepare(), which handles the more specific type.
> 
> Reported by clang when building with warnings enabled:
> 
>   drivers/pci/controller/dwc/pci-meson.c:191:6: warning: cast from 'void (*)(struct clk *)' to 'void (*)(void *)' converts to incompatible function type [-Wcast-function-type-strict]
>                                    (void (*) (void *))clk_disable_unprepare,
>                                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> No functional changes are intended.

Applied to controller/remove-void-cast, thank you everyone!

[01/03] PCI: meson: Remove cast between incompatible function type
	https://git.kernel.org/pci/pci/c/60fce60ab7b6
[02/03] PCI: keembay: Remove cast between incompatible function type
	https://git.kernel.org/pci/pci/c/43a2eef7cbba
[03/03] PCI: microchip: Remove cast between incompatible function type
	https://git.kernel.org/pci/pci/c/9e4811ce626f

	Krzysztof

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