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authorSergei Shtylylov <sshtylyov@ru.mvista.com>2008-10-05 12:23:27 -0400
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2008-10-05 12:23:27 -0400
commit22e05b4549bf2405d6aca128540b20cd2dd33f1f (patch)
tree9bf72e944f5fb7ae2c4691a76c53e4cba0c9aff9
parentf20f258603ebc5da91e76884cf0c0d7ac9804b1c (diff)
ide-dma: fix ide_build_dmatable() for TRM290
Apparently, 'xcount' being 0 does not mean 0 bytes for TRM290; it means 4 bytes, judging from the code immediately preceding this check. So, we must never try to "split" the PRD for TRM290. This is probably never hit anyway -- with the DMA buffers aligned to at least 512 bytes and ATAPI DMA not being used for non block I/O commands... Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
-rw-r--r--drivers/ide/ide-dma.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/ide/ide-dma.c b/drivers/ide/ide-dma.c
index adc682755857..3fa07c0aeaa4 100644
--- a/drivers/ide/ide-dma.c
+++ b/drivers/ide/ide-dma.c
@@ -211,7 +211,7 @@ int ide_build_dmatable (ide_drive_t *drive, struct request *rq)
211 xcount = bcount & 0xffff; 211 xcount = bcount & 0xffff;
212 if (is_trm290) 212 if (is_trm290)
213 xcount = ((xcount >> 2) - 1) << 16; 213 xcount = ((xcount >> 2) - 1) << 16;
214 if (xcount == 0x0000) { 214 else if (xcount == 0x0000) {
215 /* 215 /*
216 * Most chipsets correctly interpret a length of 0x0000 as 64KB, 216 * Most chipsets correctly interpret a length of 0x0000 as 64KB,
217 * but at least one (e.g. CS5530) misinterprets it as zero (!). 217 * but at least one (e.g. CS5530) misinterprets it as zero (!).