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path: root/drivers/usb/mon/mon_bin.c
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Diffstat (limited to 'drivers/usb/mon/mon_bin.c')
-rw-r--r--drivers/usb/mon/mon_bin.c51
1 files changed, 42 insertions, 9 deletions
diff --git a/drivers/usb/mon/mon_bin.c b/drivers/usb/mon/mon_bin.c
index 10f3205798e8..385ec0520167 100644
--- a/drivers/usb/mon/mon_bin.c
+++ b/drivers/usb/mon/mon_bin.c
@@ -16,6 +16,7 @@
#include <linux/compat.h>
#include <linux/mm.h>
#include <linux/smp_lock.h>
+#include <linux/scatterlist.h>
#include <asm/uaccess.h>
@@ -221,7 +222,7 @@ static void mon_free_buff(struct mon_pgmap *map, int npages);
/*
* This is a "chunked memcpy". It does not manipulate any counters.
*/
-static void mon_copy_to_buff(const struct mon_reader_bin *this,
+static unsigned int mon_copy_to_buff(const struct mon_reader_bin *this,
unsigned int off, const unsigned char *from, unsigned int length)
{
unsigned int step_len;
@@ -246,6 +247,7 @@ static void mon_copy_to_buff(const struct mon_reader_bin *this,
from += step_len;
length -= step_len;
}
+ return off;
}
/*
@@ -394,14 +396,44 @@ static inline char mon_bin_get_setup(unsigned char *setupb,
return 0;
}
-static char mon_bin_get_data(const struct mon_reader_bin *rp,
- unsigned int offset, struct urb *urb, unsigned int length)
+static unsigned int mon_bin_get_data(const struct mon_reader_bin *rp,
+ unsigned int offset, struct urb *urb, unsigned int length,
+ char *flag)
{
+ int i;
+ struct scatterlist *sg;
+ unsigned int this_len;
+
+ *flag = 0;
+ if (urb->num_sgs == 0) {
+ if (urb->transfer_buffer == NULL) {
+ *flag = 'Z';
+ return length;
+ }
+ mon_copy_to_buff(rp, offset, urb->transfer_buffer, length);
+ length = 0;
- if (urb->transfer_buffer == NULL)
- return 'Z';
- mon_copy_to_buff(rp, offset, urb->transfer_buffer, length);
- return 0;
+ } else {
+ /* If IOMMU coalescing occurred, we cannot trust sg_page */
+ if (urb->sg->nents != urb->num_sgs) {
+ *flag = 'D';
+ return length;
+ }
+
+ /* Copy up to the first non-addressable segment */
+ for_each_sg(urb->sg->sg, sg, urb->num_sgs, i) {
+ if (length == 0 || PageHighMem(sg_page(sg)))
+ break;
+ this_len = min_t(unsigned int, sg->length, length);
+ offset = mon_copy_to_buff(rp, offset, sg_virt(sg),
+ this_len);
+ length -= this_len;
+ }
+ if (i == 0)
+ *flag = 'D';
+ }
+
+ return length;
}
static void mon_bin_get_isodesc(const struct mon_reader_bin *rp,
@@ -536,8 +568,9 @@ static void mon_bin_event(struct mon_reader_bin *rp, struct urb *urb,
}
if (length != 0) {
- ep->flag_data = mon_bin_get_data(rp, offset, urb, length);
- if (ep->flag_data != 0) { /* Yes, it's 0x00, not '0' */
+ length = mon_bin_get_data(rp, offset, urb, length,
+ &ep->flag_data);
+ if (length > 0) {
delta = (ep->len_cap + PKT_ALIGN-1) & ~(PKT_ALIGN-1);
ep->len_cap -= length;
delta -= (ep->len_cap + PKT_ALIGN-1) & ~(PKT_ALIGN-1);