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usb/ptp: ignore zero reads

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cinap_lenrek 2011-08-17 00:46:33 +02:00
parent 961a873889
commit 9f65da6d70
1 changed files with 12 additions and 5 deletions
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17
sys/src/cmd/nusb/ptp/usbptp.c
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@ -122,10 +122,13 @@ isinterrupt(void)
static int
usbread(Dev *ep, void *data, int len)
{
int n;
int n, try;
for(;;){
n = 0;
for(try = 0; try < 4; try++){
n = read(ep->dfd, data, len);
if(n == 0)
continue;
if(n >= 0 || !isinterrupt())
break;
}
@ -135,10 +138,13 @@ usbread(Dev *ep, void *data, int len)
static int
usbwrite(Dev *ep, void *data, int len)
{
int n;
int n, try;
for(;;){
n = 0;
for(try = 0; try < 4; try++){
n = write(ep->dfd, data, len);
if(n == 0)
continue;
if(n >= 0 || !isinterrupt())
break;
}
@ -198,7 +204,7 @@ ptpcheckerr(Ptprpc *rpc, int type, int transid, int length)
char *s;
if(length < 4+2+2+4){
werrstr("short response");
werrstr("short response: %d < %d", length, 4+2+2+4);
return -1;
}
if(GET4(rpc->length) < length){
@ -291,6 +297,7 @@ ptprpc(int code, int flags, ...)
if((n = usbread(usbep[In], &rpc, sizeof(rpc))) < 0)
return -1;
if(debug)
hexdump("data<", (uchar*)&rpc, n);
if(ptpcheckerr(&rpc, 2, t, n))