From: Harvey Harrison Date: Sat, 13 Dec 2008 23:21:29 +0000 (-0800) Subject: ieee1934: dv1394: interrupt enabling/disabling broken on big-endian X-Git-Tag: v2.6.29-rc1~187^2~6 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=c82cdea1e1cb3790788d04ef5cab33488e1455c9;p=linux-2.6-omap-h63xx.git ieee1934: dv1394: interrupt enabling/disabling broken on big-endian After annotating the frame structs, this was left: drivers/ieee1394/dv1394.c:2113:23: warning: invalid assignment: |= drivers/ieee1394/dv1394.c:2113:23: left side has type restricted __le32 drivers/ieee1394/dv1394.c:2113:23: right side has type int drivers/ieee1394/dv1394.c:2121:24: warning: invalid assignment: &= drivers/ieee1394/dv1394.c:2121:24: left side has type restricted __le32 drivers/ieee1394/dv1394.c:2121:24: right side has type int drivers/ieee1394/dv1394.c:2123:24: warning: invalid assignment: |= drivers/ieee1394/dv1394.c:2123:24: left side has type restricted __le32 drivers/ieee1394/dv1394.c:2123:24: right side has type int Which looks like a real bug on a big-endian arch as it would set/clear the wrong bit. Signed-off-by: Harvey Harrison Bill Fink writes: I finally got a chance to test the patch on my kernel, and live DV viewing using xine still worked fine. Although I admit to being mystified how it works both before and after the patch, since the cpu_to_le32() calls that were added should result in byte swapping on PPC that wasn't being done before. I guess that either the code paths involved aren't actually being triggered by my xine DV viewing, or there's some fortuitous palindromic setting of bits. Tested-by: Bill Fink Signed-off-by: Stefan Richter --- diff --git a/drivers/ieee1394/dv1394.c b/drivers/ieee1394/dv1394.c index f258e618389..a329e6bd5d2 100644 --- a/drivers/ieee1394/dv1394.c +++ b/drivers/ieee1394/dv1394.c @@ -2110,17 +2110,17 @@ static void ir_tasklet_func(unsigned long data) f = video->frames[next_i / MAX_PACKETS]; next = &(f->descriptor_pool[next_i % MAX_PACKETS]); next_dma = ((unsigned long) block - (unsigned long) f->descriptor_pool) + f->descriptor_pool_dma; - next->u.in.il.q[0] |= 3 << 20; /* enable interrupt */ - next->u.in.il.q[2] = 0; /* disable branch */ + next->u.in.il.q[0] |= cpu_to_le32(3 << 20); /* enable interrupt */ + next->u.in.il.q[2] = cpu_to_le32(0); /* disable branch */ /* link previous to next */ prev_i = (next_i == 0) ? (MAX_PACKETS * video->n_frames - 1) : (next_i - 1); f = video->frames[prev_i / MAX_PACKETS]; prev = &(f->descriptor_pool[prev_i % MAX_PACKETS]); if (prev_i % (MAX_PACKETS/2)) { - prev->u.in.il.q[0] &= ~(3 << 20); /* no interrupt */ + prev->u.in.il.q[0] &= ~cpu_to_le32(3 << 20); /* no interrupt */ } else { - prev->u.in.il.q[0] |= 3 << 20; /* enable interrupt */ + prev->u.in.il.q[0] |= cpu_to_le32(3 << 20); /* enable interrupt */ } prev->u.in.il.q[2] = cpu_to_le32(next_dma | 1); /* set Z=1 */ wmb();