#include "debug.h" #include "util.h" #include int prefixcmp(const char *str, const char *prefix) { for (; ; str++, prefix++) if (!*prefix) return 0; else if (*str != *prefix) return (unsigned char)*prefix - (unsigned char)*str; } /* * Used as the default ->buf value, so that people can always assume * buf is non NULL and ->buf is NUL terminated even for a freshly * initialized strbuf. */ char strbuf_slopbuf[1]; int strbuf_init(struct strbuf *sb, ssize_t hint) { sb->alloc = sb->len = 0; sb->buf = strbuf_slopbuf; if (hint) return strbuf_grow(sb, hint); return 0; } void strbuf_release(struct strbuf *sb) { if (sb->alloc) { zfree(&sb->buf); strbuf_init(sb, 0); } } char *strbuf_detach(struct strbuf *sb, size_t *sz) { char *res = sb->alloc ? sb->buf : NULL; if (sz) *sz = sb->len; strbuf_init(sb, 0); return res; } int strbuf_grow(struct strbuf *sb, size_t extra) { char *buf; size_t nr = sb->len + extra + 1; if (nr < sb->alloc) return 0; if (nr <= sb->len) return -E2BIG; if (alloc_nr(sb->alloc) > nr) nr = alloc_nr(sb->alloc); /* * Note that sb->buf == strbuf_slopbuf if sb->alloc == 0, and it is * a static variable. Thus we have to avoid passing it to realloc. */ buf = realloc(sb->alloc ? sb->buf : NULL, nr * sizeof(*buf)); if (!buf) return -ENOMEM; sb->buf = buf; sb->alloc = nr; return 0; } int strbuf_addch(struct strbuf *sb, int c) { int ret = strbuf_grow(sb, 1); if (ret) return ret; sb->buf[sb->len++] = c; sb->buf[sb->len] = '\0'; return 0; } int strbuf_add(struct strbuf *sb, const void *data, size_t len) { int ret = strbuf_grow(sb, len); if (ret) return ret; memcpy(sb->buf + sb->len, data, len); return strbuf_setlen(sb, sb->len + len); } static int strbuf_addv(struct strbuf *sb, const char *fmt, va_list ap) { int len, ret; va_list ap_saved; if (!strbuf_avail(sb)) { ret = strbuf_grow(sb, 64); if (ret) return ret; } va_copy(ap_saved, ap); len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap); if (len < 0) return len; if (len > strbuf_avail(sb)) { ret = strbuf_grow(sb, len); if (ret) return ret; len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap_saved); va_end(ap_saved); if (len > strbuf_avail(sb)) { pr_debug("this should not happen, your vsnprintf is broken"); return -EINVAL; } } return strbuf_setlen(sb, sb->len + len); } int strbuf_addf(struct strbuf *sb, const char *fmt, ...) { va_list ap; int ret; va_start(ap, fmt); ret = strbuf_addv(sb, fmt, ap); va_end(ap); return ret; } ssize_t strbuf_read(struct strbuf *sb, int fd, ssize_t hint) { size_t oldlen = sb->len; size_t oldalloc = sb->alloc; int ret; ret = strbuf_grow(sb, hint ? hint : 8192); if (ret) return ret; for (;;) { ssize_t cnt; cnt = read(fd, sb->buf + sb->len, sb->alloc - sb->len - 1); if (cnt < 0) { if (oldalloc == 0) strbuf_release(sb); else strbuf_setlen(sb, oldlen); return cnt; } if (!cnt) break; sb->len += cnt; ret = strbuf_grow(sb, 8192); if (ret) return ret; } sb->buf[sb->len] = '\0'; return sb->len - oldlen; } rial?id=d7df2443cd5f67fc6ee7c05a88e4996e8177f91b'>serial/ti_usb_3410_5052.c
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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2017-02-03 17:10:28 +1100
committerMichael Ellerman <mpe@ellerman.id.au>2017-02-08 23:36:29 +1100
commitd7df2443cd5f67fc6ee7c05a88e4996e8177f91b (patch)
tree098a7c0ca4fceb8a65cb1f693c9d71990388933d /drivers/usb/serial/ti_usb_3410_5052.c
parenta0615a16f7d0ceb5804d295203c302d496d8ee91 (diff)
powerpc/mm: Fix spurrious segfaults on radix with autonuma
When autonuma (Automatic NUMA balancing) marks a PTE inaccessible it clears all the protection bits but leave the PTE valid. With the Radix MMU, an attempt at executing from such a PTE will take a fault with bit 35 of SRR1 set "SRR1_ISI_N_OR_G". It is thus incorrect to treat all such faults as errors. We should pass them to handle_mm_fault() for autonuma to deal with. The case of pages that are really not executable is handled by the existing test for VM_EXEC further down. That leaves us with catching the kernel attempts at executing user pages. We can catch that earlier, even before we do find_vma. It is never valid on powerpc for the kernel to take an exec fault to begin with. So fold that test with the existing test for the kernel faulting on kernel addresses to bail out early. Fixes: 1d18ad026844 ("powerpc/mm: Detect instruction fetch denied and report") Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Acked-by: Balbir Singh <bsingharora@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'drivers/usb/serial/ti_usb_3410_5052.c')