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authorRoland Dreier <roland@purestorage.com>2013-12-19 08:37:03 -0800
committerRoland Dreier <roland@purestorage.com>2013-12-20 10:53:44 -0800
commita96e4e2ffe439e45732d820fac6fee486b6412bf (patch)
tree94b6871a378f9a643f268c1e5c6ccd563fd65fa6 /drivers/infiniband/core
parent309243ec14fde1149e1c66f19746e239e86caf39 (diff)
downloadlinux-a96e4e2ffe439e45732d820fac6fee486b6412bf.tar.gz
IB/uverbs: New macro to set pointers to NULL if length is 0 in INIT_UDATA()
Trying to have a ternary operator to choose between NULL (or 0) and the real pointer value in invocations leads to an impossible choice between a sparse error about a literal 0 used as a NULL pointer, and a gcc warning about "pointer/integer type mismatch in conditional expression." Rather than clutter the source with more casts, move the ternary operator into a new INIT_UDATA_BUF_OR_NULL() macro, which makes it easier to use and simplifies its callers. Reported-by: Yann Droneaud <ydroneaud@opteya.com> Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/infiniband/core')
-rw-r--r--drivers/infiniband/core/uverbs.h8
-rw-r--r--drivers/infiniband/core/uverbs_main.c19
2 files changed, 16 insertions, 11 deletions
diff --git a/drivers/infiniband/core/uverbs.h b/drivers/infiniband/core/uverbs.h
index 9879568aed8c..a283274a5a09 100644
--- a/drivers/infiniband/core/uverbs.h
+++ b/drivers/infiniband/core/uverbs.h
@@ -55,6 +55,14 @@
(udata)->outlen = (olen); \
} while (0)
+#define INIT_UDATA_BUF_OR_NULL(udata, ibuf, obuf, ilen, olen) \
+ do { \
+ (udata)->inbuf = (ilen) ? (const void __user *) (ibuf) : NULL; \
+ (udata)->outbuf = (olen) ? (void __user *) (obuf) : NULL; \
+ (udata)->inlen = (ilen); \
+ (udata)->outlen = (olen); \
+ } while (0)
+
/*
* Our lifetime rules for these structs are the following:
*
diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c
index 34386943ebcf..699463bbfd2d 100644
--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -676,17 +676,14 @@ static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
return -EINVAL;
}
- INIT_UDATA(&ucore,
- (hdr.in_words) ? buf : 0,
- (unsigned long)ex_hdr.response,
- hdr.in_words * 8,
- hdr.out_words * 8);
-
- INIT_UDATA(&uhw,
- (ex_hdr.provider_in_words) ? buf + ucore.inlen : 0,
- (ex_hdr.provider_out_words) ? (unsigned long)ex_hdr.response + ucore.outlen : 0,
- ex_hdr.provider_in_words * 8,
- ex_hdr.provider_out_words * 8);
+ INIT_UDATA_BUF_OR_NULL(&ucore, buf, (unsigned long) ex_hdr.response,
+ hdr.in_words * 8, hdr.out_words * 8);
+
+ INIT_UDATA_BUF_OR_NULL(&uhw,
+ buf + ucore.inlen,
+ (unsigned long) ex_hdr.response + ucore.outlen,
+ ex_hdr.provider_in_words * 8,
+ ex_hdr.provider_out_words * 8);
err = uverbs_ex_cmd_table[command](file,
&ucore,