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| author | David Brownell <david-b@pacbell.net> | 2006-04-02 10:37:40 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-05-16 14:33:57 -0700 |
| commit | a9948b6194b46e489aa3b4d111d6dfd786c39c4b (patch) | |
| tree | 28f4984be0547c773ad24ef6ed882f1ae9cbede8 /drivers/spi | |
| parent | 747d844ee9a183ff3067bb1181f2a25c50649538 (diff) | |
| download | lwn-a9948b6194b46e489aa3b4d111d6dfd786c39c4b.tar.gz lwn-a9948b6194b46e489aa3b4d111d6dfd786c39c4b.zip | |
[PATCH] SPI: spi bounce buffer has a minimum length
Make sure that spi_write_then_read() can always handle at least 32 bytes
of transfer (total, both directions), minimizing one portability issue.
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 94f5e8ed83a7..1168ef015887 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -522,7 +522,8 @@ int spi_sync(struct spi_device *spi, struct spi_message *message) } EXPORT_SYMBOL_GPL(spi_sync); -#define SPI_BUFSIZ (SMP_CACHE_BYTES) +/* portable code must never pass more than 32 bytes */ +#define SPI_BUFSIZ max(32,SMP_CACHE_BYTES) static u8 *buf; |