From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jirislaby@kernel.org>, Qing Wang <wangqing@vivo.com>
Subject: [PATCH v2 1/1] serial: 8250_mid: Balance reference count for PCI DMA device
Date: Wed, 23 Feb 2022 17:11:24 +0200 [thread overview]
Message-ID: <20220223151124.70026-1-andriy.shevchenko@linux.intel.com> (raw)
The pci_get_slot() increases its reference count, the caller
must decrement the reference count by calling pci_dev_put().
Fixes: 90b9aacf912a ("serial: 8250_pci: add Intel Tangier support")
Fixes: f549e94effa1 ("serial: 8250_pci: add Intel Penwell ports")
Depends-on: d9eda9bab237 ("serial: 8250_pci: Intel MID UART support to its own driver")
Reported-by: Qing Wang <wangqing@vivo.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
v2: rebased on top of the latest tty-linus
drivers/tty/serial/8250/8250_mid.c | 19 +++++++++++++++----
1 file changed, 15 insertions(+), 4 deletions(-)
diff --git a/drivers/tty/serial/8250/8250_mid.c b/drivers/tty/serial/8250/8250_mid.c
index 83592b51a996..a2a03acb04ad 100644
--- a/drivers/tty/serial/8250/8250_mid.c
+++ b/drivers/tty/serial/8250/8250_mid.c
@@ -73,6 +73,11 @@ static int pnw_setup(struct mid8250 *mid, struct uart_port *p)
return 0;
}
+static void pnw_exit(struct mid8250 *mid)
+{
+ pci_dev_put(mid->dma_dev);
+}
+
static int tng_handle_irq(struct uart_port *p)
{
struct mid8250 *mid = p->private_data;
@@ -124,6 +129,11 @@ static int tng_setup(struct mid8250 *mid, struct uart_port *p)
return 0;
}
+static void tng_exit(struct mid8250 *mid)
+{
+ pci_dev_put(mid->dma_dev);
+}
+
static int dnv_handle_irq(struct uart_port *p)
{
struct mid8250 *mid = p->private_data;
@@ -328,9 +338,9 @@ static int mid8250_probe(struct pci_dev *pdev, const struct pci_device_id *id)
pci_set_drvdata(pdev, mid);
return 0;
+
err:
- if (mid->board->exit)
- mid->board->exit(mid);
+ mid->board->exit(mid);
return ret;
}
@@ -340,8 +350,7 @@ static void mid8250_remove(struct pci_dev *pdev)
serial8250_unregister_port(mid->line);
- if (mid->board->exit)
- mid->board->exit(mid);
+ mid->board->exit(mid);
}
static const struct mid8250_board pnw_board = {
@@ -349,6 +358,7 @@ static const struct mid8250_board pnw_board = {
.freq = 50000000,
.base_baud = 115200,
.setup = pnw_setup,
+ .exit = pnw_exit,
};
static const struct mid8250_board tng_board = {
@@ -356,6 +366,7 @@ static const struct mid8250_board tng_board = {
.freq = 38400000,
.base_baud = 1843200,
.setup = tng_setup,
+ .exit = tng_exit,
};
static const struct mid8250_board dnv_board = {
--
2.34.1
reply other threads:[~2022-02-23 15:11 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20220223151124.70026-1-andriy.shevchenko@linux.intel.com \
--to=andriy.shevchenko@linux.intel.com \
--cc=gregkh@linuxfoundation.org \
--cc=jirislaby@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-serial@vger.kernel.org \
--cc=wangqing@vivo.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox