#include #include #include #include #include #include #include #include #include #include static int verbose; static void do_read(int fd, int len) { unsigned char buf[32], *bp; int status; /* read at least 2 bytes, no more than 32 */ if (len < 2) len = 2; else if (len > sizeof(buf)) len = sizeof(buf); memset(buf, 0, sizeof buf); status = read(fd, buf, len); if (status < 0) { perror("read"); return; } if (status != len) { fprintf(stderr, "short read\n"); return; } printf("read(%2d, %2d): %02x %02x,", len, status, buf[0], buf[1]); status -= 2; bp = buf + 2; while (status-- > 0) printf(" %02x", *bp++); printf("\n"); } static void do_msg(int fd, int len) { struct spi_ioc_transfer xfer[2]; unsigned char buf[32], *bp; int status; memset(xfer, 0, sizeof xfer); memset(buf, 0, sizeof buf); if (len > sizeof buf) len = sizeof buf; buf[0] = 0xaa; xfer[0].tx_buf = (unsigned long)buf; xfer[0].len = 1; xfer[1].rx_buf = (unsigned long) buf; xfer[1].len = len; status = ioctl(fd, SPI_IOC_MESSAGE(2), xfer); if (status < 0) { perror("SPI_IOC_MESSAGE"); return; } printf("response(%2d, %2d): ", len, status); for (bp = buf; len; len--) printf(" %02x", *bp++); printf("\n"); } static void dumpstat(const char *name, int fd) { __u8 lsb, bits; __u32 mode, speed; if (ioctl(fd, SPI_IOC_RD_MODE32, &mode) < 0) { perror("SPI rd_mode"); return; } if (ioctl(fd, SPI_IOC_RD_LSB_FIRST, &lsb) < 0) { perror("SPI rd_lsb_fist"); return; } if (ioctl(fd, SPI_IOC_RD_BITS_PER_WORD, &bits) < 0) { perror("SPI bits_per_word"); return; } if (ioctl(fd, SPI_IOC_RD_MAX_SPEED_HZ, &speed) < 0) { perror("SPI max_speed_hz"); return; } printf("%s: spi mode 0x%x, %d bits %sper word, %d Hz max\n", name, mode, bits, lsb ? "(lsb first) " : "", speed); } int main(int argc, char **argv) { int c; int readcount = 0; int msglen = 0; int fd; const char *name; while ((c = getopt(argc, argv, "hm:r:v")) != EOF) { switch (c) { case 'm': msglen = atoi(optarg); if (msglen < 0) goto usage; continue; case 'r': readcount = atoi(optarg); if (readcount < 0) goto usage; continue; case 'v': verbose++; continue; case 'h': case '?': usage: fprintf(stderr, "usage: %s [-h] [-m N] [-r N] /dev/spidevB.D\n", argv[0]); return 1; } } if ((optind + 1) != argc) goto usage; name = argv[optind]; fd = open(name, O_RDWR); if (fd < 0) { perror("open"); return 1; } dumpstat(name, fd); if (msglen) do_msg(fd, msglen); if (readcount) do_read(fd, readcount); close(fd); return 0; } ='txt' type='search' size='10' name='q' value=''/>
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authorChristoph Hellwig <hch@lst.de>2017-01-30 13:15:41 +0100
committerBjorn Helgaas <bhelgaas@google.com>2017-02-02 10:35:46 -0600
commitdfef358bd1beb4e7b5c94eca944be9cd23dfc752 (patch)
treeb9a2afb38a4c2ac8ad31f49ec0d71fe9e5b1994c /net/rxrpc/skbuff.c
parent030305d69fc6963c16003f50d7e8d74b02d0a143 (diff)
PCI/MSI: Don't apply affinity if there aren't enough vectors left
Bart reported a problem wіth an out of bounds access in the low-level IRQ affinity code, which we root caused to the qla2xxx driver assigning all its MSI-X vectors to the pre and post vectors, and not having any left for the actually spread IRQs. Fix this issue by not asking for affinity assignment when there are no vectors to assign left. Fixes: 402723ad5c62 ("PCI/MSI: Provide pci_alloc_irq_vectors_affinity()") Link: https://lkml.kernel.org/r/1485359225.3093.3.camel@sandisk.com Reported-by: Bart Van Assche <bart.vanassche@sandisk.com> Tested-by: Bart Van Assche <bart.vanassche@sandisk.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'net/rxrpc/skbuff.c')