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orinoco: Annotate ezusb_read_ltv() 

ezusb_read_ltv() is always invoked via the ->read_ltv() callback. This
callback is mostly invoked under orinoco_lock() which disables BH.

There are a few invocations during probe which occur in preemptible
context via:
   ezusb_probe() -> orinoco_init() -> determine_fw_capabilities()

Extend `hermes_ops' with the ->read_ltv_pr callback which is implemented
with the same callback like ->read_ltv on `hermes_ops_local'.
On `ezusb_ops' ->read_ltv is used for callbacks under the lock which
need to poll.
The new ->read_ltv_pr() is used in the preemptible context in which it
is possible to wait for the completion. Provide HERMES_READ_RECORD_PR()
and hermes_read_wordrec_pr() which behave like their non _pr equivalents
and invoke ->read_ltv_pr().

This removes the last user of ezusb_req_ctx_wait() and can now be
removed.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20201113212252.2243570-11-bigeasy@linutronix.de
This commit is contained in:
Sebastian Andrzej Siewior 2020-11-13 22:22:52 +01:00 committed by Kalle Valo
parent a9a2678aba
commit a3d8a2599d
4 changed files with 52 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/net/wireless/intersil/orinoco/hermes.c
View File

@ -763,6 +763,7 @@ static const struct hermes_ops hermes_ops_local = {
.init_cmd_wait = hermes_doicmd_wait,
.allocate = hermes_allocate,
.read_ltv = hermes_read_ltv,
.read_ltv_pr = hermes_read_ltv,
.write_ltv = hermes_write_ltv,
.bap_pread = hermes_bap_pread,
.bap_pwrite = hermes_bap_pwrite,

15
drivers/net/wireless/intersil/orinoco/hermes.h
View File

@ -386,6 +386,8 @@ struct hermes_ops {
int (*allocate)(struct hermes *hw, u16 size, u16 *fid);
int (*read_ltv)(struct hermes *hw, int bap, u16 rid, unsigned buflen,
u16 *length, void *buf);
int (*read_ltv_pr)(struct hermes *hw, int bap, u16 rid,
unsigned buflen, u16 *length, void *buf);
int (*write_ltv)(struct hermes *hw, int bap, u16 rid,
u16 length, const void *value);
int (*bap_pread)(struct hermes *hw, int bap, void *buf, int len,
@ -494,6 +496,8 @@ static inline void hermes_clear_words(struct hermes *hw, int off,
#define HERMES_READ_RECORD(hw, bap, rid, buf) \
(hw->ops->read_ltv((hw), (bap), (rid), sizeof(*buf), NULL, (buf)))
#define HERMES_READ_RECORD_PR(hw, bap, rid, buf) \
(hw->ops->read_ltv_pr((hw), (bap), (rid), sizeof(*buf), NULL, (buf)))
#define HERMES_WRITE_RECORD(hw, bap, rid, buf) \
(hw->ops->write_ltv((hw), (bap), (rid), \
HERMES_BYTES_TO_RECLEN(sizeof(*buf)), (buf)))
@ -509,6 +513,17 @@ static inline int hermes_read_wordrec(struct hermes *hw, int bap, u16 rid,
return err;
}
static inline int hermes_read_wordrec_pr(struct hermes *hw, int bap, u16 rid,
u16 *word)
{
__le16 rec;
int err;
err = HERMES_READ_RECORD_PR(hw, bap, rid, &rec);
*word = le16_to_cpu(rec);
return err;
}
static inline int hermes_write_wordrec(struct hermes *hw, int bap, u16 rid,
u16 word)
{

32
drivers/net/wireless/intersil/orinoco/hw.c
View File

@ -78,7 +78,7 @@ int determine_fw_capabilities(struct orinoco_private *priv,
char tmp[SYMBOL_MAX_VER_LEN + 1] __attribute__((aligned(2)));
/* Get the hardware version */
err = HERMES_READ_RECORD(hw, USER_BAP, HERMES_RID_NICID, &nic_id);
err = HERMES_READ_RECORD_PR(hw, USER_BAP, HERMES_RID_NICID, &nic_id);
if (err) {
dev_err(dev, "Cannot read hardware identity: error %d\n",
err);
@ -101,7 +101,7 @@ int determine_fw_capabilities(struct orinoco_private *priv,
priv->firmware_type = determine_firmware_type(&nic_id);
/* Get the firmware version */
err = HERMES_READ_RECORD(hw, USER_BAP, HERMES_RID_STAID, &sta_id);
err = HERMES_READ_RECORD_PR(hw, USER_BAP, HERMES_RID_STAID, &sta_id);
if (err) {
dev_err(dev, "Cannot read station identity: error %d\n",
err);
@ -177,7 +177,7 @@ int determine_fw_capabilities(struct orinoco_private *priv,
/* 3Com MAC : 00:50:DA:* */
memset(tmp, 0, sizeof(tmp));
/* Get the Symbol firmware version */
err = hw->ops->read_ltv(hw, USER_BAP,
err = hw->ops->read_ltv_pr(hw, USER_BAP,
HERMES_RID_SECONDARYVERSION_SYMBOL,
SYMBOL_MAX_VER_LEN, NULL, &tmp);
if (err) {
@ -286,7 +286,7 @@ int orinoco_hw_read_card_settings(struct orinoco_private *priv, u8 *dev_addr)
u16 reclen;
/* Get the MAC address */
err = hw->ops->read_ltv(hw, USER_BAP, HERMES_RID_CNFOWNMACADDR,
err = hw->ops->read_ltv_pr(hw, USER_BAP, HERMES_RID_CNFOWNMACADDR,
ETH_ALEN, NULL, dev_addr);
if (err) {
dev_warn(dev, "Failed to read MAC address!\n");
@ -296,7 +296,7 @@ int orinoco_hw_read_card_settings(struct orinoco_private *priv, u8 *dev_addr)
dev_dbg(dev, "MAC address %pM\n", dev_addr);
/* Get the station name */
err = hw->ops->read_ltv(hw, USER_BAP, HERMES_RID_CNFOWNNAME,
err = hw->ops->read_ltv_pr(hw, USER_BAP, HERMES_RID_CNFOWNNAME,
sizeof(nickbuf), &reclen, &nickbuf);
if (err) {
dev_err(dev, "failed to read station name\n");
@ -312,7 +312,7 @@ int orinoco_hw_read_card_settings(struct orinoco_private *priv, u8 *dev_addr)
dev_dbg(dev, "Station name \"%s\"\n", priv->nick);
/* Get allowed channels */
err = hermes_read_wordrec(hw, USER_BAP, HERMES_RID_CHANNELLIST,
err = hermes_read_wordrec_pr(hw, USER_BAP, HERMES_RID_CHANNELLIST,
&priv->channel_mask);
if (err) {
dev_err(dev, "Failed to read channel list!\n");
@ -320,13 +320,13 @@ int orinoco_hw_read_card_settings(struct orinoco_private *priv, u8 *dev_addr)
}
/* Get initial AP density */
err = hermes_read_wordrec(hw, USER_BAP, HERMES_RID_CNFSYSTEMSCALE,
err = hermes_read_wordrec_pr(hw, USER_BAP, HERMES_RID_CNFSYSTEMSCALE,
&priv->ap_density);
if (err || priv->ap_density < 1 || priv->ap_density > 3)
priv->has_sensitivity = 0;
/* Get initial RTS threshold */
err = hermes_read_wordrec(hw, USER_BAP, HERMES_RID_CNFRTSTHRESHOLD,
err = hermes_read_wordrec_pr(hw, USER_BAP, HERMES_RID_CNFRTSTHRESHOLD,
&priv->rts_thresh);
if (err) {
dev_err(dev, "Failed to read RTS threshold!\n");
@ -335,11 +335,11 @@ int orinoco_hw_read_card_settings(struct orinoco_private *priv, u8 *dev_addr)
/* Get initial fragmentation settings */
if (priv->has_mwo)
err = hermes_read_wordrec(hw, USER_BAP,
err = hermes_read_wordrec_pr(hw, USER_BAP,
HERMES_RID_CNFMWOROBUST_AGERE,
&priv->mwo_robust);
else
err = hermes_read_wordrec(hw, USER_BAP,
err = hermes_read_wordrec_pr(hw, USER_BAP,
HERMES_RID_CNFFRAGMENTATIONTHRESHOLD,
&priv->frag_thresh);
if (err) {
@ -351,7 +351,7 @@ int orinoco_hw_read_card_settings(struct orinoco_private *priv, u8 *dev_addr)
if (priv->has_pm) {
priv->pm_on = 0;
priv->pm_mcast = 1;
err = hermes_read_wordrec(hw, USER_BAP,
err = hermes_read_wordrec_pr(hw, USER_BAP,
HERMES_RID_CNFMAXSLEEPDURATION,
&priv->pm_period);
if (err) {
@ -359,7 +359,7 @@ int orinoco_hw_read_card_settings(struct orinoco_private *priv, u8 *dev_addr)
"period!\n");
goto out;
}
err = hermes_read_wordrec(hw, USER_BAP,
err = hermes_read_wordrec_pr(hw, USER_BAP,
HERMES_RID_CNFPMHOLDOVERDURATION,
&priv->pm_timeout);
if (err) {
@ -371,7 +371,7 @@ int orinoco_hw_read_card_settings(struct orinoco_private *priv, u8 *dev_addr)
/* Preamble setup */
if (priv->has_preamble) {
err = hermes_read_wordrec(hw, USER_BAP,
err = hermes_read_wordrec_pr(hw, USER_BAP,
HERMES_RID_CNFPREAMBLE_SYMBOL,
&priv->preamble);
if (err) {
@ -381,21 +381,21 @@ int orinoco_hw_read_card_settings(struct orinoco_private *priv, u8 *dev_addr)
}
/* Retry settings */
err = hermes_read_wordrec(hw, USER_BAP, HERMES_RID_SHORTRETRYLIMIT,
err = hermes_read_wordrec_pr(hw, USER_BAP, HERMES_RID_SHORTRETRYLIMIT,
&priv->short_retry_limit);
if (err) {
dev_err(dev, "Failed to read short retry limit\n");
goto out;
}
err = hermes_read_wordrec(hw, USER_BAP, HERMES_RID_LONGRETRYLIMIT,
err = hermes_read_wordrec_pr(hw, USER_BAP, HERMES_RID_LONGRETRYLIMIT,
&priv->long_retry_limit);
if (err) {
dev_err(dev, "Failed to read long retry limit\n");
goto out;
}
err = hermes_read_wordrec(hw, USER_BAP, HERMES_RID_MAXTRANSMITLIFETIME,
err = hermes_read_wordrec_pr(hw, USER_BAP, HERMES_RID_MAXTRANSMITLIFETIME,
&priv->retry_lifetime);
if (err) {
dev_err(dev, "Failed to read max retry lifetime\n");

49
drivers/net/wireless/intersil/orinoco/orinoco_usb.c
View File

@ -667,32 +667,6 @@ static void ezusb_request_in_callback(struct ezusb_priv *upriv,
typedef void (*ezusb_ctx_wait)(struct ezusb_priv *, struct request_context *);
static void ezusb_req_ctx_wait(struct ezusb_priv *upriv,
struct request_context *ctx)
{
switch (ctx->state) {
case EZUSB_CTX_QUEUED:
case EZUSB_CTX_REQ_SUBMITTED:
case EZUSB_CTX_REQ_COMPLETE:
case EZUSB_CTX_RESP_RECEIVED:
if (in_softirq()) {
/* If we get called from a timer, timeout timers don't
* get the chance to run themselves. So we make sure
* that we don't sleep for ever */
int msecs = DEF_TIMEOUT * (1000 / HZ);
while (!try_wait_for_completion(&ctx->done) && msecs--)
udelay(1000);
} else {
wait_for_completion(&ctx->done);
}
break;
default:
/* Done or failed - nothing to wait for */
break;
}
}
static void ezusb_req_ctx_wait_compl(struct ezusb_priv *upriv,
struct request_context *ctx)
{
@ -1032,8 +1006,10 @@ static int ezusb_write_ltv(struct hermes *hw, int bap, u16 rid,
ezusb_req_ctx_wait_poll);
}
static int ezusb_read_ltv(struct hermes *hw, int bap, u16 rid,
unsigned bufsize, u16 *length, void *buf)
static int __ezusb_read_ltv(struct hermes *hw, int bap, u16 rid,
unsigned bufsize, u16 *length, void *buf,
ezusb_ctx_wait ezusb_ctx_wait_func)
{
struct ezusb_priv *upriv = hw->priv;
struct request_context *ctx;
@ -1046,7 +1022,21 @@ static int ezusb_read_ltv(struct hermes *hw, int bap, u16 rid,
return -ENOMEM;
return ezusb_access_ltv(upriv, ctx, 0, NULL, EZUSB_FRAME_CONTROL,
buf, bufsize, length, ezusb_req_ctx_wait);
buf, bufsize, length, ezusb_req_ctx_wait_poll);
}
static int ezusb_read_ltv(struct hermes *hw, int bap, u16 rid,
unsigned bufsize, u16 *length, void *buf)
{
return __ezusb_read_ltv(hw, bap, rid, bufsize, length, buf,
ezusb_req_ctx_wait_poll);
}
static int ezusb_read_ltv_preempt(struct hermes *hw, int bap, u16 rid,
unsigned bufsize, u16 *length, void *buf)
{
return __ezusb_read_ltv(hw, bap, rid, bufsize, length, buf,
ezusb_req_ctx_wait_compl);
}
static int ezusb_doicmd_wait(struct hermes *hw, u16 cmd, u16 parm0, u16 parm1,
@ -1586,6 +1576,7 @@ static const struct hermes_ops ezusb_ops = {
.init_cmd_wait = ezusb_doicmd_wait,
.allocate = ezusb_allocate,
.read_ltv = ezusb_read_ltv,
.read_ltv_pr = ezusb_read_ltv_preempt,
.write_ltv = ezusb_write_ltv,
.bap_pread = ezusb_bap_pread,
.read_pda = ezusb_read_pda,