From: Julien Brunel Date: Thu, 21 Aug 2008 17:46:30 +0000 (+0200) Subject: [S390] drivers/s390: Use an IS_ERR test rather than a NULL test X-Git-Tag: v2.6.27-rc5~67 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=0983e56835cbf4796e8f5780c549c32ac1c3afac;p=linux-2.6-omap-h63xx.git [S390] drivers/s390: Use an IS_ERR test rather than a NULL test In case of error, functions dasd_kmalloc_request and idal_buffer_alloc return an ERR pointer, but never return the NULL pointer. So after a call to one of these functions, a NULL test should be replaced by an IS_ERR test. A simplified version of the semantic patch that makes this change is as follows: (http://www.emn.fr/x-info/coccinelle/) // @correct_null_test@ expression x,E; statement S1, S2; @@ x = ( dasd_kmalloc_request(...) | idal_buffer_alloc(...) ) <... when != x = E if ( ( - x@p2 != NULL + ! IS_ERR ( x ) | - x@p2 == NULL + IS_ERR( x ) ) ) S1 else S2 ...> ? x = E; // Signed-off-by: Julien Brunel Signed-off-by: Julia Lawall Signed-off-by: Martin Schwidefsky --- diff --git a/drivers/s390/block/dasd_eer.c b/drivers/s390/block/dasd_eer.c index 29da4413ad4..bf512ac75b9 100644 --- a/drivers/s390/block/dasd_eer.c +++ b/drivers/s390/block/dasd_eer.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include @@ -457,7 +458,7 @@ int dasd_eer_enable(struct dasd_device *device) cqr = dasd_kmalloc_request("ECKD", 1 /* SNSS */, SNSS_DATA_SIZE, device); - if (!cqr) + if (IS_ERR(cqr)) return -ENOMEM; cqr->startdev = device; diff --git a/drivers/s390/char/tape_char.c b/drivers/s390/char/tape_char.c index 687720b552d..be0ce2215c8 100644 --- a/drivers/s390/char/tape_char.c +++ b/drivers/s390/char/tape_char.c @@ -109,7 +109,7 @@ tapechar_check_idalbuffer(struct tape_device *device, size_t block_size) /* The current idal buffer is not correct. Allocate a new one. */ new = idal_buffer_alloc(block_size, 0); - if (new == NULL) + if (IS_ERR(new)) return -ENOMEM; if (device->char_data.idal_buf != NULL) diff --git a/drivers/s390/char/tape_std.c b/drivers/s390/char/tape_std.c index 2a1af4e60be..cc8fd781ee2 100644 --- a/drivers/s390/char/tape_std.c +++ b/drivers/s390/char/tape_std.c @@ -248,7 +248,7 @@ tape_std_mtsetblk(struct tape_device *device, int count) /* Allocate a new idal buffer. */ new = idal_buffer_alloc(count, 0); - if (new == NULL) + if (IS_ERR(new)) return -ENOMEM; if (device->char_data.idal_buf != NULL) idal_buffer_free(device->char_data.idal_buf);