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| author | Jeff Garzik <jeff@garzik.org> | 2006-03-30 00:18:49 +0200 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2006-03-30 00:18:49 +0200 |
| commit | e02a4cabfcb9a999b74a2e2e6f13ffcb7ff2d606 (patch) | |
| tree | 2f3db60be4c57eca2a4c3ab3f3122dcf1ec0c624 /drivers/char/hvc_vio.c | |
| parent | [PATCH] libata: add FIXME above ata_dev_xfermask() (diff) | |
| parent | Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 (diff) | |
| download | linux-e02a4cabfcb9a999b74a2e2e6f13ffcb7ff2d606.tar.xz linux-e02a4cabfcb9a999b74a2e2e6f13ffcb7ff2d606.zip | |
Merge branch 'master'
Diffstat (limited to 'drivers/char/hvc_vio.c')
| -rw-r--r-- | drivers/char/hvc_vio.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/char/hvc_vio.c b/drivers/char/hvc_vio.c index f5212eb2b41d..9add81ceb440 100644 --- a/drivers/char/hvc_vio.c +++ b/drivers/char/hvc_vio.c @@ -31,10 +31,13 @@ #include <linux/types.h> #include <linux/init.h> + #include <asm/hvconsole.h> #include <asm/vio.h> #include <asm/prom.h> +#include "hvc_console.h" + char hvc_driver_name[] = "hvc_console"; static struct vio_device_id hvc_driver_table[] __devinitdata = { @@ -48,6 +51,14 @@ static int filtered_get_chars(uint32_t vtermno, char *buf, int count) unsigned long got; int i; + /* + * Vio firmware will read up to SIZE_VIO_GET_CHARS at its own discretion + * so we play safe and avoid the situation where got > count which could + * overload the flip buffer. + */ + if (count < SIZE_VIO_GET_CHARS) + return -EAGAIN; + got = hvc_get_chars(vtermno, buf, count); /* |