From 27600805e62f800bacf990354632eae4e487d34c Mon Sep 17 00:00:00 2001 From: Yazen Ghannam Date: Thu, 3 Sep 2026 10:43:25 -0500 Subject: x86/amd_node: Fix PCI device reference counting in amd_smn_init() The local "root" pointer is a temporary variable used during the device search. Therefore, refcount related to the search iterators should be cleaned up after the search is complete. Use the __free() cleanup macro to ensure the refcount is decremented when the temporary pointer goes out of scope. Additionally, increment the refcount when caching a root pointer. This ensures the in-use refcount is separate from the temporary search refcounting. Finally, drop the redundant "root = NULL" before the second search loop. The pci_get_class() iterator always decrements the refcount of its "from" argument, so the first loop can only fall through with "root" already NULL. Fixes: 0a4b61d9c2e4 ("x86/amd_node: Fix AMD root device caching") Closes: https://sashiko.dev/#/patchset/20260806160159.230453-1-jason.andryuk%40amd.com Reported-by: Sashiko Assisted-by: LLM Signed-off-by: Yazen Ghannam Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Mario Limonciello (AMD) Cc: Link: https://patch.msgid.link/20260903154325.74343-1-yazen.ghannam@amd.com --- drivers/accessibility/speakup/buffers.c | 124 ++++++++++++++++++++++++++++++++ 1 file changed, 124 insertions(+) create mode 100644 drivers/accessibility/speakup/buffers.c (limited to 'drivers/accessibility/speakup/buffers.c') diff --git a/drivers/accessibility/speakup/buffers.c b/drivers/accessibility/speakup/buffers.c new file mode 100644 index 000000000..1371ced2f --- /dev/null +++ b/drivers/accessibility/speakup/buffers.c @@ -0,0 +1,124 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include + +#include "speakup.h" +#include "spk_priv.h" + +#define SYNTH_BUF_SIZE 8192 /* currently 8K bytes */ + +static u16 synth_buffer[SYNTH_BUF_SIZE]; /* guess what this is for! */ +static u16 *buff_in = synth_buffer; +static u16 *buff_out = synth_buffer; +static u16 *buffer_end = synth_buffer + SYNTH_BUF_SIZE - 1; + +/* These try to throttle applications by stopping the TTYs + * Note: we need to make sure that we will restart them eventually, which is + * usually not possible to do from the notifiers. TODO: it should be possible + * starting from linux 2.6.26. + * + * So we only stop when we know alive == 1 (else we discard the data anyway), + * and the alive synth will eventually call start_ttys from the thread context. + */ +void speakup_start_ttys(void) +{ + int i; + + for (i = 0; i < MAX_NR_CONSOLES; i++) { + if (speakup_console[i] && speakup_console[i]->tty_stopped) + continue; + if (vc_cons[i].d && vc_cons[i].d->port.tty) + start_tty(vc_cons[i].d->port.tty); + } +} +EXPORT_SYMBOL_GPL(speakup_start_ttys); + +static void speakup_stop_ttys(void) +{ + int i; + + for (i = 0; i < MAX_NR_CONSOLES; i++) + if (vc_cons[i].d && vc_cons[i].d->port.tty) + stop_tty(vc_cons[i].d->port.tty); +} + +static int synth_buffer_free(void) +{ + int chars_free; + + if (buff_in >= buff_out) + chars_free = SYNTH_BUF_SIZE - (buff_in - buff_out); + else + chars_free = buff_out - buff_in; + return chars_free; +} + +int synth_buffer_empty(void) +{ + return (buff_in == buff_out); +} +EXPORT_SYMBOL_GPL(synth_buffer_empty); + +void synth_buffer_add(u16 ch) +{ + if (!synth->alive) { + /* This makes sure that we won't stop TTYs if there is no synth + * to restart them + */ + return; + } + if (synth_buffer_free() <= 100) { + synth_start(); + speakup_stop_ttys(); + } + if (synth_buffer_free() <= 1) + return; + *buff_in++ = ch; + if (buff_in > buffer_end) + buff_in = synth_buffer; + /* We have written something to the speech synthesis, so we are not + * paused any more. + */ + spk_paused = false; +} + +u16 synth_buffer_getc(void) +{ + u16 ch; + + if (buff_out == buff_in) + return 0; + ch = *buff_out++; + if (buff_out > buffer_end) + buff_out = synth_buffer; + return ch; +} +EXPORT_SYMBOL_GPL(synth_buffer_getc); + +u16 synth_buffer_peek(void) +{ + if (buff_out == buff_in) + return 0; + return *buff_out; +} +EXPORT_SYMBOL_GPL(synth_buffer_peek); + +void synth_buffer_skip_nonlatin1(void) +{ + while (buff_out != buff_in) { + if (*buff_out < 0x100) + return; + buff_out++; + if (buff_out > buffer_end) + buff_out = synth_buffer; + } +} +EXPORT_SYMBOL_GPL(synth_buffer_skip_nonlatin1); + +void synth_buffer_clear(void) +{ + buff_in = synth_buffer; + buff_out = synth_buffer; +} +EXPORT_SYMBOL_GPL(synth_buffer_clear); -- cgit v1.3.1