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[list] Add list_first_entry()

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There are several points in the iPXE codebase where
list_for_each_entry() is (ab)used to extract only the first entry from
a list.  Add a macro list_first_entry() to make this code easier to
read.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2010-11-08 02:51:18 +00:00
parent 295ba15bd6
commit ea631f6fb8
7 changed files with 41 additions and 28 deletions
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10
src/net/infiniband.c
View File

@@ -982,12 +982,12 @@ struct ib_device * find_ibdev ( union ib_gid *gid ) {
struct ib_device * last_opened_ibdev ( void ) {
struct ib_device *ibdev;
list_for_each_entry ( ibdev, &open_ib_devices, open_list ) {
assert ( ibdev->open_count != 0 );
return ibdev;
}
ibdev = list_first_entry ( &open_ib_devices, struct ib_device, list );
if ( ! ibdev )
return NULL;
return NULL;
assert ( ibdev->open_count != 0 );
return ibdev;
}
/* Drag in IPoIB */