diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/scsi/st.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c index ddf2630b347..c6f19ee8f2c 100644 --- a/drivers/scsi/st.c +++ b/drivers/scsi/st.c @@ -3695,6 +3695,8 @@ static struct st_buffer *new_tape_buffer(int need_dma, int max_sg) /* Try to allocate enough space in the tape buffer */ +#define ST_MAX_ORDER 6 + static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma) { int segs, nbr, max_segs, b_size, order, got; @@ -3723,9 +3725,16 @@ static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dm b_size = PAGE_SIZE << order; } else { for (b_size = PAGE_SIZE, order = 0; - order <= 6 && b_size < new_size; order++, b_size *= 2) + order < ST_MAX_ORDER && b_size < new_size; + order++, b_size *= 2) ; /* empty */ } + if (max_segs * (PAGE_SIZE << order) < new_size) { + if (order == ST_MAX_ORDER) + return 0; + normalize_buffer(STbuffer); + return enlarge_buffer(STbuffer, new_size, need_dma); + } for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size; segs < max_segs && got < new_size;) { |