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authorJulia Lawall <julia@diku.dk>2009-09-22 19:46:29 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-23 10:39:45 -0400
commit72445af880dbcd41cffd0d7b78a8c74da093e9eb (patch)
tree48bd4c2c98bda4d548b931482e4b000e13b88a4e /drivers
parentd3c7a3f71a103abb7af5bdaf1adf6f693913a4a9 (diff)
drivers/rtc: correct error-handling code
This code is not executed before ds1307->rtc has been successfully initialized to the result of calling rtc_device_register. Thus the test that ds1307->rtc is not NULL is always true. A simplified version of the semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @match exists@ expression x, E; statement S1, S2; @@ x = rtc_device_register(...) ... when != x = E ( * if (x == NULL || ...) S1 else S2 | * if (x == NULL && ...) S1 else S2 ) // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Acked-by: Wolfram Sang <w.sang@pengutronix.de> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/rtc/rtc-ds1307.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index 47a93c022d91..eb99ee4fa0f5 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -896,8 +896,7 @@ read_rtc:
896 return 0; 896 return 0;
897 897
898exit_irq: 898exit_irq:
899 if (ds1307->rtc) 899 rtc_device_unregister(ds1307->rtc);
900 rtc_device_unregister(ds1307->rtc);
901exit_free: 900exit_free:
902 kfree(ds1307); 901 kfree(ds1307);
903 return err; 902 return err;