* [PATCH] drivers/scsi/csiostor: do not sleep with a spin lock held
@ 2022-01-19 5:59 cgel.zte
2022-01-19 8:45 ` Damien Le Moal
0 siblings, 1 reply; 5+ messages in thread
From: cgel.zte @ 2022-01-19 5:59 UTC (permalink / raw)
To: jejb
Cc: martin.petersen, linux-scsi, linux-kernel, Minghao Chi,
Zeal Robot, CGEL ZTE
From: Minghao Chi <chi.minghao@zte.com.cn>
The might_sleep_if function in the mempool_alloc
may cause a sleep lock.We can't mempool_alloc()
with a spin lock held, so bring it up front.
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Minghao Chi <chi.minghao@zte.com.cn>
Signed-off-by: CGEL ZTE <cgel.zte@gmail.com>
---
drivers/scsi/csiostor/csio_attr.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/scsi/csiostor/csio_attr.c b/drivers/scsi/csiostor/csio_attr.c
index 200e50089711..3d4ab439c756 100644
--- a/drivers/scsi/csiostor/csio_attr.c
+++ b/drivers/scsi/csiostor/csio_attr.c
@@ -424,8 +424,8 @@ csio_fcoe_alloc_vnp(struct csio_hw *hw, struct csio_lnode *ln)
/* Issue VNP cmd to alloc vport */
/* Allocate Mbox request */
- spin_lock_irq(&hw->lock);
mbp = mempool_alloc(hw->mb_mempool, GFP_ATOMIC);
+ spin_lock_irq(&hw->lock);
if (!mbp) {
CSIO_INC_STATS(hw, n_err_nomem);
ret = -ENOMEM;
@@ -505,8 +505,8 @@ csio_fcoe_free_vnp(struct csio_hw *hw, struct csio_lnode *ln)
/* Issue VNP cmd to free vport */
/* Allocate Mbox request */
- spin_lock_irq(&hw->lock);
mbp = mempool_alloc(hw->mb_mempool, GFP_ATOMIC);
+ spin_lock_irq(&hw->lock);
if (!mbp) {
CSIO_INC_STATS(hw, n_err_nomem);
ret = -ENOMEM;
--
2.25.1
^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [PATCH] drivers/scsi/csiostor: do not sleep with a spin lock held
2022-01-19 5:59 [PATCH] drivers/scsi/csiostor: do not sleep with a spin lock held cgel.zte
@ 2022-01-19 8:45 ` Damien Le Moal
2022-01-19 8:57 ` cgel.zte
0 siblings, 1 reply; 5+ messages in thread
From: Damien Le Moal @ 2022-01-19 8:45 UTC (permalink / raw)
To: cgel.zte, jejb
Cc: martin.petersen, linux-scsi, linux-kernel, Minghao Chi,
Zeal Robot
On 1/19/22 14:59, cgel.zte@gmail.com wrote:
> From: Minghao Chi <chi.minghao@zte.com.cn>
>
> The might_sleep_if function in the mempool_alloc
> may cause a sleep lock.We can't mempool_alloc()
> with a spin lock held, so bring it up front.
But the allocation is GFP_ATOMIC, which does not have
__GFP_DIRECT_RECLAIM, so how come mempool_alloc() triggers the
might_sleep() warning ?
>
> Reported-by: Zeal Robot <zealci@zte.com.cn>
> Signed-off-by: Minghao Chi <chi.minghao@zte.com.cn>
> Signed-off-by: CGEL ZTE <cgel.zte@gmail.com>
> ---
> drivers/scsi/csiostor/csio_attr.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/scsi/csiostor/csio_attr.c b/drivers/scsi/csiostor/csio_attr.c
> index 200e50089711..3d4ab439c756 100644
> --- a/drivers/scsi/csiostor/csio_attr.c
> +++ b/drivers/scsi/csiostor/csio_attr.c
> @@ -424,8 +424,8 @@ csio_fcoe_alloc_vnp(struct csio_hw *hw, struct csio_lnode *ln)
>
> /* Issue VNP cmd to alloc vport */
> /* Allocate Mbox request */
> - spin_lock_irq(&hw->lock);
> mbp = mempool_alloc(hw->mb_mempool, GFP_ATOMIC);
> + spin_lock_irq(&hw->lock);
> if (!mbp) {
> CSIO_INC_STATS(hw, n_err_nomem);
> ret = -ENOMEM;
> @@ -505,8 +505,8 @@ csio_fcoe_free_vnp(struct csio_hw *hw, struct csio_lnode *ln)
> /* Issue VNP cmd to free vport */
> /* Allocate Mbox request */
>
> - spin_lock_irq(&hw->lock);
> mbp = mempool_alloc(hw->mb_mempool, GFP_ATOMIC);
> + spin_lock_irq(&hw->lock);
> if (!mbp) {
> CSIO_INC_STATS(hw, n_err_nomem);
> ret = -ENOMEM;
--
Damien Le Moal
Western Digital Research
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [PATCH] drivers/scsi/csiostor: do not sleep with a spin lock held
2022-01-19 8:45 ` Damien Le Moal
@ 2022-01-19 8:57 ` cgel.zte
2022-01-19 9:05 ` Damien Le Moal
0 siblings, 1 reply; 5+ messages in thread
From: cgel.zte @ 2022-01-19 8:57 UTC (permalink / raw)
To: damien.lemoal
Cc: cgel.zte, chi.minghao, jejb, linux-kernel, linux-scsi,
martin.petersen, zealci
The might_sleep_if(gfp_mask & __GFP_DIRECT_RECLAIM) in the
mempool_alloc function uses __GFP_DIRECT_RECLAIM.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] drivers/scsi/csiostor: do not sleep with a spin lock held
2022-01-19 8:57 ` cgel.zte
@ 2022-01-19 9:05 ` Damien Le Moal
2022-01-19 9:22 ` cgel.zte
0 siblings, 1 reply; 5+ messages in thread
From: Damien Le Moal @ 2022-01-19 9:05 UTC (permalink / raw)
To: cgel.zte
Cc: chi.minghao, jejb, linux-kernel, linux-scsi, martin.petersen,
zealci
On 1/19/22 17:57, cgel.zte@gmail.com wrote:
>
> The might_sleep_if(gfp_mask & __GFP_DIRECT_RECLAIM) in the
> mempool_alloc function uses __GFP_DIRECT_RECLAIM.
But the call to mempool_alloc() specifies GFP_ATOMIC, which does not
have __GFP_DIRECT_RECLAIM, so "gfp_mask & __GFP_DIRECT_RECLAIM" should
be false, and the might_sleep_if() not triggering. How can you see the
might sleep warning ?
--
Damien Le Moal
Western Digital Research
^ permalink raw reply [flat|nested] 5+ messages in thread
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2022-01-19 5:59 [PATCH] drivers/scsi/csiostor: do not sleep with a spin lock held cgel.zte
2022-01-19 8:45 ` Damien Le Moal
2022-01-19 8:57 ` cgel.zte
2022-01-19 9:05 ` Damien Le Moal
2022-01-19 9:22 ` cgel.zte
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