watchdog: ts72xx_wdt: locking bug in ioctl
commit 8612ed0d97abcf1c016d34755b7cf2060de71963 upstream. Calling the WDIOC_GETSTATUS & WDIOC_GETBOOTSTATUS and twice will cause a interruptible deadlock. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be> Cc: Jonghwan Choi <jhbird.choi@samsung.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -310,7 +310,8 @@ static long ts72xx_wdt_ioctl(struct file *file, unsigned int cmd,
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case WDIOC_GETSTATUS:
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case WDIOC_GETBOOTSTATUS:
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return put_user(0, p);
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error = put_user(0, p);
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break;
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case WDIOC_KEEPALIVE:
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ts72xx_wdt_kick(wdt);
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