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| author | Atsushi Nemoto <anemo@mba.ocn.ne.jp> | 2008-11-02 21:40:10 +0100 |
|---|---|---|
| committer | Bartlomiej Zolnierkiewicz <bzolnier@gmail.com> | 2008-11-02 21:40:10 +0100 |
| commit | 7afa05350c42d8427f2d8f6112b64ab0812f3289 (patch) | |
| tree | 07a972ee758fa975dc4f524df6e3f37628938255 /drivers/ide/tx4938ide.c | |
| parent | 9d4eb0a33e620a85e36f66cf895d2bea6d556eac (diff) | |
| download | lwn-7afa05350c42d8427f2d8f6112b64ab0812f3289.tar.gz lwn-7afa05350c42d8427f2d8f6112b64ab0812f3289.zip | |
tx4938ide: Avoid underflow on calculation of a wait cycle
Make 'wt' variable signed while it can be negative during calculation.
Suggested-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: sshtylyov@ru.mvista.com
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Diffstat (limited to 'drivers/ide/tx4938ide.c')
| -rw-r--r-- | drivers/ide/tx4938ide.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/ide/tx4938ide.c b/drivers/ide/tx4938ide.c index 796289cf97e0..9120063e8f87 100644 --- a/drivers/ide/tx4938ide.c +++ b/drivers/ide/tx4938ide.c @@ -26,12 +26,13 @@ static void tx4938ide_tune_ebusc(unsigned int ebus_ch, unsigned int sp = (cr >> 4) & 3; unsigned int clock = gbus_clock / (4 - sp); unsigned int cycle = 1000000000 / clock; - unsigned int wt, shwt; + unsigned int shwt; + int wt; /* Minimum DIOx- active time */ wt = DIV_ROUND_UP(t->act8b, cycle) - 2; /* IORDY setup time: 35ns */ - wt = max(wt, DIV_ROUND_UP(35, cycle)); + wt = max_t(int, wt, DIV_ROUND_UP(35, cycle)); /* actual wait-cycle is max(wt & ~1, 1) */ if (wt > 2 && (wt & 1)) wt++; |