linux-kernel - [PATCH 1/2] spi: delete premature free

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1378115661-5371-2-git-send-email-Julia.Lawall@lip6.fr>
Date:	Mon,  2 Sep 2013 11:54:20 +0200
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Mark Brown <broonie@...nel.org>
Cc:	kernel-janitors@...r.kernel.org, linux-spi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] spi: delete premature free_irq

From: Julia Lawall <Julia.Lawall@...6.fr>

Free_irq is not needed if there has been no request_irq.  Free_irq is
removed from both the probe and remove functions.  The correct request_irq
and free_irq appear to be in the add_host and remove_host functions in
spi-dw.c.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression e;
@@

*e = platform_get_irq(...);
... when != request_irq(e,...)
*free_irq(e,...)
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
Not tested.

 drivers/spi/spi-dw-mmio.c |    5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/spi/spi-dw-mmio.c b/drivers/spi/spi-dw-mmio.c
index 4aa8be8..168c620 100644
--- a/drivers/spi/spi-dw-mmio.c
+++ b/drivers/spi/spi-dw-mmio.c
@@ -74,7 +74,7 @@ static int dw_spi_mmio_probe(struct platform_device *pdev)
 	dwsmmio->clk = clk_get(&pdev->dev, NULL);
 	if (IS_ERR(dwsmmio->clk)) {
 		ret = PTR_ERR(dwsmmio->clk);
-		goto err_irq;
+		goto err_unmap;
 	}
 	clk_enable(dwsmmio->clk);
 
@@ -94,8 +94,6 @@ err_clk:
 	clk_disable(dwsmmio->clk);
 	clk_put(dwsmmio->clk);
 	dwsmmio->clk = NULL;
-err_irq:
-	free_irq(dws->irq, dws);
 err_unmap:
 	iounmap(dws->regs);
 err_release_reg:
@@ -115,7 +113,6 @@ static int dw_spi_mmio_remove(struct platform_device *pdev)
 	clk_put(dwsmmio->clk);
 	dwsmmio->clk = NULL;
 
-	free_irq(dwsmmio->dws.irq, &dwsmmio->dws);
 	dw_spi_remove_host(&dwsmmio->dws);
 	iounmap(dwsmmio->dws.regs);
 	kfree(dwsmmio);

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/