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authorMarc Zyngier <maz@misterjones.org>2006-02-27 12:08:00 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-27 08:18:04 -0800
commitd904ffd6e0c3ab7631b07c21c9f9234a2e72d1f3 (patch)
treee872c4fcbbf661cccd40d5c414801544c5ef8a5c /drivers/char
parente95a9ec1bb66e07b138861c743192f06e7b3e4de (diff)
[PATCH] Fix Specialix SX corruption
With the latest kernels, I experienced some strange corruption, some '*****' being randomly inserted in the character flow, like this: ashes:~# ashes:~# a*******shes:~# ashes:~# ashes:~# Further investigation shows that the problem was introduced during Alan's "TTY layer buffering revamp" patch, the amount of data to be copied being reduced after buffer allocation. Moving the count fixup around solves the problem. Signed-off-by: Marc Zyngier <maz@misterjones.org> Approved-by: Rogier Wolff <R.E.Wolff@BitWizard.nl> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/sx.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/char/sx.c b/drivers/char/sx.c
index 588e75ec163..a6b4f02bdce 100644
--- a/drivers/char/sx.c
+++ b/drivers/char/sx.c
@@ -1095,17 +1095,17 @@ static inline void sx_receive_chars (struct sx_port *port)
sx_dprintk (SX_DEBUG_RECEIVE, "rxop=%d, c = %d.\n", rx_op, c);
+ /* Don't copy past the end of the hardware receive buffer */
+ if (rx_op + c > 0x100) c = 0x100 - rx_op;
+
+ sx_dprintk (SX_DEBUG_RECEIVE, "c = %d.\n", c);
+
/* Don't copy more bytes than there is room for in the buffer */
c = tty_prepare_flip_string(tty, &rp, c);
sx_dprintk (SX_DEBUG_RECEIVE, "c = %d.\n", c);
- /* Don't copy past the end of the hardware receive buffer */
- if (rx_op + c > 0x100) c = 0x100 - rx_op;
-
- sx_dprintk (SX_DEBUG_RECEIVE, "c = %d.\n", c);
-
/* If for one reason or another, we can't copy more data, we're done! */
if (c == 0) break;