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[media] ivtv: udma: handle get_user_pages() returning fewer pages than we asked for 

get_user_pages() may return fewer page than we ask for.  As we give up and
return an error in this case, we need to put_page() each of the pages we
did get.

[Andy Walls modified the patch, only removing the braces in the 'for'
statement, to eliminate a checkpatch warning.]

Signed-off-by: Paul Cassella <fortytwo-ivtv@manetheren.bigw.org>
Signed-off-by: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
wifi-calibration
Paul Cassella 2011-02-08 22:22:52 -03:00 committed by Mauro Carvalho Chehab
parent e45c2be970
commit 793e71b667
1 changed files with 6 additions and 1 deletions
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7
drivers/media/video/ivtv/ivtv-udma.c
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@ -132,7 +132,12 @@ int ivtv_udma_setup(struct ivtv *itv, unsigned long ivtv_dest_addr,
if (user_dma.page_count != err) {
IVTV_DEBUG_WARN("failed to map user pages, returned %d instead of %d\n",
err, user_dma.page_count);
return -EINVAL;
if (err >= 0) {
for (i = 0; i < err; i++)
put_page(dma->map[i]);
return -EINVAL;
}
return err;
}
dma->page_count = user_dma.page_count;